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English dictionary
Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
actinide
1.
actinide
(substance)
any of a series of radioactive elements with atomic numbers 89 through 103
Synonyms
actinoid
,
actinon
Broader (hypernym)
group
,
grouping
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. English edition:
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.
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